Lighting fixture



Dec. 11, 1956 e. E. GLATTHAR ETAL 2,773,976

LIGHTING FIXTURE Filed March 16, 19543 l/V MEN 7' OR George E G/ofibarArf/n/r W Mafie'son United States Patent lice LIGHTING FIXTURE George E.GlatthanUniversity Heights, and Arthur W.

"Matteson, Lakewood, Ohio, assignors to The Art Metal Company,Cleveland, Ohio, a corporation of Ohio This invention relates toimprovements in lighting fixtures.

One of the objects of the present invention is to provide a lightingfixture having a high light output efliciency and providing as muchlight as possible with little brightness and glare.

A further object of the present invention is to provide a lightingfixture having structural simplicity, being economical to manufacture,designed for easy assembly and being of strong and sturdy construction.

Other features of this invention reside in the arrangement and design ofthe parts for carrying out their appropriate functions.

Other objects and advantages of this invention will be apparent from theaccompanying drawing and description and the essential features will beset forth in the appended claim.

The drawing shows a side elevational view of the lighting fixturepartially in section.

Before the form of lighting fixture here illustrated is specificallydescribed, it is to be understood that the invention here involved isnot limited to the structural details or arrangement of parts here shownsince structures embodying the present invention may take various forms.It also is to be understood that the phraseology or terminology hereinemployed is for purposes of description and not limitation since thescope of the present invention is denoted by the appended claim.

Those familiar with this art will recognize that the present inventionmay be applied in many ways, but it has been chosen to illustrate thesame as a ceiling lighting fixture with one of the conventional typeelectric bulbs.

The lighting fixture as shown comprises a support having a ceilingcanopy 11 adapted to be secured to a room ceiling in the conventionalmanner with a downwardly directed socket husk 12 secured thereto. Areflector flood type or processed lamp bulb 13 is provided with a baseadapted to be detachably mounted in said socket husk 12, with said basebeing of the conventional screw type or any other desired structure. Anannular bulb portion 13b projects downwardly from the base and isgenerally made of glass or any other equivalent or satisfactory materialwith this bulb portion 13b having an annular outer surface increasing inlateral dimensions to a maximum diameter as it extends downwardly awayfrom the base and having a convex light transmitting surface, such asclear or translucent glass, shown at 13c bridging across this maximumdimension. The reflector flood type or processed lamp bulb 13 has aninner reflecting face 13d formed on the inner wall of the annularsurface of bulb portion 13b with this reflecting face being or" highlypolished metallic coated material,

or any other equivalent reflecting surface.

A light reflector means is provided in the present disclosure fordirecting the light from said bulb 13. This reflector means includes alight multiplier reflector 15 Secured to the support 10, associatedwith, and projecting 2,773,976 I Patented Dec. 11,-

downwardly from the bulb 13. This reflector 15 has an outwardly andupwardly extending light fixture bowl 16, annular in form, secured byits lower edge to the light exit lower end of the reflector by weldingor any other equivalent connection. The bowl 16 is secured to thesupport 10 by a plurality ofspaced rods 17 with each rod having-hooks atopposite ends-detachably secured in a hole 12a in the bottom of thesocket husk 12 and in a hole 18a in a bracket 18 riveted or otherwisesecured to the inner and upper face of the bowl 16.

This reflector 15 has a specular, highly polished inner reflectingsurface. This reflector 15 can be made of aluminum and be given a highlypolished surface to achieve this result so that there is less lightabsorption and increased lighting efliciency. This reflector 15 isannular in form and coaxial with the longitudinal axis of bulb 13 with alight entrance upper end adjacent to and generally surrounding andequally spaced from the maximum dimension of bulb portion 13b. Its lightexit lower end is formed by making the annular reflector surfacetherebetween gradually increase in lateral dimension along a curveconstructed to serve as an extension of the bulb portion reflectinginner face 13d to form therewith a generally continuous curve, asclearly shown in Fig. l. The light entrance upper end of reflector 15extends upwardly above the lower edge of bulb reflecting face 13d.Therefore, the reflector flood type or processed lamp bulb 13 with itsreflector inner face 13d combines with reflector 15 to form a largelight reflector means for controlling the downward light distribution.This reflector 15 acts as a light directing shield so that substantiallyall the light outwardly directed from the exit end is confined within adownwardly directed cone coaxial with the reflector and bulblongitudinal axes and having approximately a 45 apex angle between thesurface of the cone and the axis thereof, as shown in Fig. 1. Therefore,the light multiplier specular reflector 15 and bulb reflector inner face13d intercepts the lamp light above 45 and redirects it into the usefullight zone below 45. As much light as possible is directed down into theuseful light zone at a distance therefrom. The curved shape of thereflector is a combination of an ellipse and a parabola combined forbest light distribution with minimum brightness.

It should now be apparent that the present lighting fixture has a highlighting efliciency and directs the downwardly directed light within anarrow working zone to provide as much light as possible with littlebrightness at a distance.

Various changes in deta-ils and arrangement of parts can be made by oneskilled in the art without departing from the spirit of this inventionor the scope of the appended claim.

What we claim is:

A lighting fixture, comprising a support, a reflector type processedbulb having a base detachably mounted in said support and a portionprojecting from said base, said bulb portion having a surface with aninner reflecting face increasing in lateral dimensions to a maximum asit extends away from said base and having a convex light transmittingsurface bridging across said maximum dimension, and a light directingspecular reflector secured to said support and associated with saidbulb, said reflector having an annular inner reflecting specular surfacecoaxial with the longitudinal bulb axis, said reflector having a lightentrance end adjacent to and generally surrounding and equally spacedfrom said maximum dimension and having a light exit and remote therefromwith the annular surface therebetween gradually increasing in lateraldimension along a curve constructed so that the reflector innerreflecting specular surface is an extension of said bulb portionreflecting inner face to fdrmtherewitha generam 'continuous reflectingcurve surface, said reflector acting-as alight directing shield so thatsubstantially all the light outwardly directed from said exit end iseonfined withina cone coaxial with the lfiethrf ldngitndinai' axis I 7References Cited in the file' cf'this patent STATES 811,621 Boas et a1.t Apr. 10, 1906 1,137,954 Cravath May 4, 1915 1,390,070 Villaret V- 1Sept.- 6, 1921 Sheafler Oct. 12, 1926 Zimmerman June 28,1927 Ames .Nov.20, 1928 Rambusch Nov. 7, 1939 Stair et a1. Nov. 5, 1940 Lanquist Sept.11, 1951 Runge et a1. Oct. 6, 1953 FOREIGN PATENTS Great Britain A. D1906 France A. D

